Strange shift of the whole page on IE7

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Strange shift of the whole page on IE7 scBen 4/13/12 1:00 PM
Hello,

I'm having troubles with a side effect of selectivizr... I really need
my :last-child and :first-child to work properly, and it does on IE8
now that I've set up the script.

However, on IE7, the whole page shifts to the right. As in : all the
elements with a floating parameter suddenly appear to have a magical
margin-left of 70% at least.

Here's the page and the code : http://buroscope.eu/csi/br/www/bubbles/

What do you make of it?